ActiveRecord::Store - no implicit conversion of ActiveSupport::HashWithIndifferentAccess into String

store_bug_test.rb

# Activate the gem you are reporting the issue against.
gem 'activerecord', '4.0.2'
require 'active_record'
require 'minitest/autorun'
require 'logger'

# Ensure backward compatibility with Minitest 4
Minitest::Test = MiniTest::Unit::TestCase unless defined?(Minitest::Test)

# This connection will do for database-independent bug reports.
ActiveRecord::Base.establish_connection(adapter: 'sqlite3', database: ':memory:')
ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Schema.define do
  create_table :posts do |t|
    t.text :data
  end
end

class Post < ActiveRecord::Base
  store :data, accessors: [:information], coder: JSON
end

class StoreBugTest < Minitest::Test
  def test_without_setting_any_accessors
    post = Post.create!
    dumped = YAML.dump post
    loaded = YAML.load dumped

    YAML.dump loaded #passes
  end

  def test_with_setting_accessors
    post = Post.create!(information: 'important stuff')
    dumped = YAML.dump post
    loaded = YAML.load dumped

    YAML.dump loaded #fails
  end
end